Press pot and process of making same



Aug. 7, 1928. 1,679,464

F. s. CARVER YRESS POT AND PROCESS OF MAKING SAME Filed March 14, 1925 INVENTOR BYwwn' M ATTORN EY Patented Aug. 7, 1928.

FRED S. CARVER, OF EAST ORANGE, NEW JERSEY.

PRESS POT AND PROCESS OF MAKING SAME.

Application filed March 14, 1925. Serial No. 15,642.

My invention relates to a pot for pot presses, and particularly to the provlsion of a forged steel press pot forged and machined in circular form and thereafter fiattened on the sides and provided with side lu s.

Tn my prior Patents, Nos. 1,247,078 of Nov. 20, 1917, and 1,47 8,699 of Dec. 25, 1923,

I have illustrated press ots constructed of cast steel, as has always eretofore been the practice.

Press pots have always heretofore been of cast metal in order to obtain the necessary shape to include the side lugs. Exceptfor the convenience of obtaining this form in a simple manner, cast steel is otherwise not specially well adapted for this purpose. It is impossible in cast steel to get the close grained, dense metal essential for obtalning the inner bore of high accuracy, smoothness and good wearing qualities, which are essential, except by the expedient of rolling and planishing the machined surface to close the relatively coarse grain of the cast steel. Many castings have to be rejected because of blowholes or because the grain is too open. In order to save other less defective castings, it is frequently necessary to resort to welding and plugging up the holes. In many cases the defective character of the castings, which ultimately have to be discarded, does not appear until after expensive machine work has been done on them.

By the present invention a forged pot is made possible, the foregoing and other defects are eliminated and a pot is provided which is of extremely dense, close grained, strong metal throughout,with practically no discards or loss of machine work.

A very essential feature of my improved pot is that it may be made by forging and machining a uniform circular section, which gives the uniform dense metal and the smooth finish required.

The forged pot is made with an outwardly projecting annulus of the forged metal, which after being forged and machined in the round can be flattened off on two 0pposite sides to permit the attachment of the lugs by which the pot is supported and guided in use, and can be slotted for attachment of the stop, handle, etc.

With press pots as heretofore constructed with the lugs, stop, etc., cast as an integral portion of the cast steel pot, it was necessary because of the interruption of lathe work by the projecting lugs and stop to resort to fil ing, chipping and like operations to finish the pot in the circular lines or region thereof wherein these projecting parts are located.

By constructing my improved pot in the manner described, the finishing operation can be done wholly in a lathe and this work can be done much more accurately and is greatly facilitated.

In the accompanying drawings, Fig. 1 is a half plan of a press pot forging. Fig. 2 is a front view partly in section of the forging shown in plan in Fig. 1. Fig. 3 is a plan view of the completed pot with the sides flattened and the lugs inserted. Fig. 4 is a front view partly in section, the section being on the line 14, Fig. 3, and Fig. 5 is a detail section on the line 55, Fig. 3.

Figs. 1 and 2 illustrate the machined forging of uniformcircular section on all planes parallel to the base and top, prior toflatpening off the sides and inserting the side ugs.

The press pot is designated generally by the reference character 10 and the heavy outwardly projecting annulus by reference I numeral 12. The construction of such forging 10 may be performed in various ways, as by piercing and rolling aring or by forging direct to shape in suitably formed dies with the necessary allowances for finishing.

After the forging is completed and machined, preferably in a lathe, all the treatment and operations up to this time being on the basis of a uniform circular section (Figs. 1 and 2), the flats 14, 1 1 are machined off on opposite sides and the slots 16, 16 cut in these flattened sides for reception of the supporting and guiding lugs 18, 18. The guide lugs 18, 18 are secured in place in such manner as to become a permanent rigidly connected part of the pot and practically one with the pot. l/Vhile preferably inserted in grooves 16, the lugs 18 may be secured in place in other ways, as will be apparent. After the lugs 18, 18 are forced 0r driven into place in the slots 16, 16, they ma be fastened as by welding or by means 0 the pins 20 driven into holes provided for the purpose, the holes being preferably drilled not all the way through, as indicated in Fig. 5, so that there is no chance of them working loose. The width of the projecting annulus 12 is sufficiently great to provide ample room for pins 20, 20 at or near each end of the lug.

Other parts may be attached after the forged pot is circularly machined in the lathe. For example, a vertical slot 22 can be cut in the edge of annulus 12 and the stop 24 bolted in place therein. Handle 26 can be attached by the same bolt 28 made use of for attaching the stop 24.

lVhen the bore 30 has been machined, a dense smooth metal wall is obtained directly with no need for planishing or other ope '2 tions for securing surface density and smoothness as are necessary with a cast pot.

I claim:

1. The process of making a press pot, which includes the steps of forging same as a ring of uniform circular section, machining same as a ring of uniform circular section, thereafter flattening the ring on opposite sides, and attaching guide lugs to the flattened parts.

2. The process of making a press pot, which includes the steps of forging same as a ring of uniform circular section, ma-

chining same as a ring of uniform circular section, machining flat parts on opposite exterior sides of the ring, machining slots in these flat portions, and inserting guide lugs in the slots.

3. A forged pot for pot presses comprising a ring forged and machined as a uniform circular section, said ring being flattened on its sides and provided with grooves for the reception of side lugs, and side lugs rigidly secured in said grooves.

l. The process of making a press pot, which includes the steps of forming same as a ring of uniform circular section, machining same as a ring of uniform circular section with an outwardly projecting annular portion, and rigidly attaching guide lugs to the opposite sides of said annular portion.

In testimony whereof, I have signed my name hereto.

FRED S. CARVER. 

